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From page 149... ... NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 137 APPENDIX G WORKSHOP SLIDES This appendix includes the slides and presenter notes used in one of the workshops presented during the project. Read the entire page →
From page 150... ... NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 138 - A brief demonstration of the SLS-Tool. - Opportunity for discussion and feedback on the user guide and the SLS-Tool. Read the entire page →
From page 151... ... NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 139 5. Human factors are another consideration. Read the entire page →
From page 152... ... NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 140 7. An agency's policy can also be a major factor in the setting of speed limits. Read the entire page →
From page 153... ... NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 141 9. As part of the NCHRP 17-76 project, the research team reviewed state websites to identify materials that document how to set a posted speed limit. Read the entire page →
From page 154... ... NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 142 principle of the MUTCD is that through uniformity, consistent driver expectations can improve safety. Within Section 2B.13 of the MUTCD are several paragraphs related to the selection of the posted speed limit value including Paragraph 1 (standard) Read the entire page →
From page 155... ... NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 143 In July 2017, the National Transportation Safety Board (NTSB) published a report on speeding (Reducing Speeding-Related Crashes Involving Passenger Vehicles) Read the entire page →
From page 156... ... NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 144 13. To address the NTSB recommendations, the National Committee on Uniform Traffic Control Devices (NCUTCD) Read the entire page →
From page 157... ... NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 145 14. One of the questions from the NCUTCD task force survey was "How would you set speed limits if given the choice? Read the entire page →
From page 158... ... NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 146 16. When developing the user guide and the SLS-Tool, the research team established guiding principles. Read the entire page →
From page 159... ... NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 147 18. Additional guiding principles for the spreadsheet tool are listed on this slide. Read the entire page →
From page 160... ... NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 148 20. Overall, the development of the suggested speed limit follows the four steps shown on this slide. Read the entire page →
From page 161... ... NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 149 22. The user identifies the roadway type, again using the definitions provided in NCHRP Research Report 855. Read the entire page →
From page 162... ... NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 150 24. The driver's operating speed, as measured by the 85th percentile speed and the 50th percentile speed, is used as starting points for identifying the suggested speed limit. Read the entire page →
From page 163... ... NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 151 26. Safety is considered through the provision of crashes. Read the entire page →
From page 164... ... NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 152 28. The graph shows the relative rate of involvement of being in a crash when compared to the average speed. Read the entire page →
From page 165... ... NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 153 D Read the entire page →
From page 166... ... NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 154 30. In addition to the hundreds of operating speed data available from the Austin, Texas, dataset, the research team has been provided speed limit studies for several other sites. Read the entire page →
From page 167... ... NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 155 speeds. Stated in another manner, the number on the speed limit sign does matter, and it does have a relationship with the operating speed. Read the entire page →
From page 168... ... NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 156 NCHRP 17-76 focused Phase II research efforts on those functional class roads. Two databases were created. Read the entire page →
From page 169... ... NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 157 35. The rest of the presentation showed the decision rules and examples of the tool interface (they were removed from this publication because they were dated material; see Appendix F for discussion of decision rules and the user guide for examples of the SLS-Tool) Read the entire page →

From page 149...

... NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 137 APPENDIX G WORKSHOP SLIDES This appendix includes the slides and presenter notes used in one of the workshops presented during the project.